New consumer unit on old wiring? It can get EXPENSIVE!
1. What even is a consumer unit?
Where the electricity comes in to your home you'll find your meter and after the meter you will find your consumer unit. The consumer unit is the box that distributes electricity around your home and in larger properties you may have multiple consumer units. For example, you might have a separate garage consumer unit or perhaps a separate home office consumer unit.
If you have a meter box on the wall outside your home, your consumer unit is often located close by on the inside but that's not always the case!